Gorgeous plant...any ideas??

I have this lovely plant in my garden, its situated in a sheltered spot, quite sunny aspect. Its about 2 feet at its tallest (I have it tied to a cane as it tends to flop all over if I dont!) I wondered if anyone could shed any light. Its got gorgeous pale lime/lemon leaves which start off a pale reddish before they mature, no flowers, just foliage. The leaves are about 5cms long when fully grown, this picture doesnt do it justice Im afraid!

Thankyou!

 

I think it's a Spiraea japonica Goldflame.

 

If it only grows about 2 to 3 feet, then I would agree with Lavender. My first thought though was , Philadelphus coronarius aureus.